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About downtrail

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  1. downtrail

    High-voltage Tacho and Link

    Just short out the first resistor in tachometer signal input. That chip is fine with a 12v square wave so just feed it directly from link output.
  2. downtrail

    DIY Fuel injection thread.

    We use design spark electrical for doing electrical drawings.
  3. I use press and laser in Hamilton for my bits. Not sure they do alloy tho. Always good prices for steel parts tho.
  4. downtrail

    4AGE CAS modification

    Have you made sure the polarity of the reluctor is correct? If you have it backwards you will encounter many headaches.
  5. downtrail

    DIY Fuel injection thread.

    Hey mate. Yes i can take a look for you if youd like. Get in touch via facebook page.
  6. downtrail

    DIY Fuel injection thread.

    I normally just mount them all on a piece of perspex and screw it in somewhere. I have actually bought in a fuse box same as the one roman put up. Just got it bare with terminals and have to say its not bad at all and im sure itll find its way into something.
  7. downtrail

    DIY Fuel injection thread.

    Yes the feed ro injectors need to be switched with ignition. If they have const bat voltage it will back feed the ecu through the flyback circuit and cause weird stuff to happen. Just put a relay in the 12v feed to injectors and switch it with ignition.
  8. downtrail

    DIY Fuel injection thread.

    You will want to raise the fuel pressure with boost as there is a positive pressure now being applied to the fuel injectors outlet. The extra fuel pressure is to over come the pressure difference across the injector. So to make speed density tuning work well and be predictable. Yes you should have a boost refrenced fuel regulator.
  9. downtrail

    DIY Fuel injection thread.

    Does the speedduino software have a setting called tooth skip or something like that under cranking settings. It makes sure it counts the missing tooth a certin number of times before engaging the ignition. Pretty much helps it stabilise and figure out where it is while cranking before applying fuel and spark.
  10. downtrail

    Arduino stuff/ programing/so cheap

    Thought about doing something like that but never really came up with a clean way of getting the cylinders into the gearbox without some major modifications. If it was a cable shifter for a fwd by all means hook straight onto the the cables or gearbox but for this box think itll be easiest to run it how it is. Hardest thing is consistancy ive got a bunch of magnetic sensors to go onto the cylinders so the software knows what gear it is actually in so it can react to a missed gear or wrong gear type of thing.
  11. downtrail

    Arduino stuff/ programing/so cheap

    Buy a bread board and some jumper wires to make it easy to prototype diffrent projects. Youll thank me later lol 3.3V/5V MB102 Breadboard power module MB-102 830 points Solderless Prototype Bread board kit 65 Flexible jumper wires
  12. downtrail

    Arduino stuff/ programing/so cheap

    Even started on a program to setup all the timings via a serial connection.
  13. downtrail

    Arduino stuff/ programing/so cheap

    Almost anything is possible within reason. I started on this project a while ago using an arduino uno. It now embedded on its own pcb and been through many revisions and still not finished haha. <media> </media>
  14. downtrail

    injector style confusions

    Yeah sorry mate nothing good. Problems with oversized injectors are with the ecu unable to control low pw well enough causing poor injector control. Most modern ecus have pretty good injector control. Another issue is poor injector data which leads to poor fuel calculations which leads to poor injector control. Which leads to poor idle quality.
  15. downtrail

    DIY Fuel injection thread.

    Most motors will respond better with more fuel whilst warming up. at around 13.5:1 -> 14.0:1 at idle this can be pulled at around 40->50 deg coolent temp to get you to 14.7 or where ever you idle at. The reason you have noticed the injector pw increse as you increse as your throttle position is that you are introducing more air into the motor. You will notice cranking vaccum drop away and more fuel injected because of this. So you have identified that you require more fuel to get it to start with no throttle opening. If injector pw were to remain constant whilst opening the throttle and this got it to start you would be too rich as you need more air to get the required mix to ignite.